docs: Remove FOSSA badge (argoproj#20038)

Signed-off-by: Josh Soref <jsoref@gmail.com>

README.md

@@ -8,7 +8,6 @@
 [![codecov](https://codecov.io/gh/argoproj/argo-cd/branch/master/graph/badge.svg)](https://codecov.io/gh/argoproj/argo-cd)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/4486/badge)](https://bestpractices.coreinfrastructure.org/projects/4486)
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/argoproj/argo-cd/badge)](https://scorecard.dev/viewer/?uri=github.com/argoproj/argo-cd)
-[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fargoproj%2Fargo-cd.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Fargoproj%2Fargo-cd?ref=badge_shield)
 
 **Social:**
 [![Twitter Follow](https://img.shields.io/twitter/follow/argoproj?style=social)](https://twitter.com/argoproj)